South Central U.S.

The South Central United States or South Central states is a region of the United States located in the south central part of the country. It evolved out of the Old Southwest, which originally was literally the western U.S. South, as can be seen in the now defunct Southwest Conference of the NCAA. The states of Arkansas, Louisiana, Oklahoma, and Texas (which make up what the Census Bureau Division calls West South Central States) are almost always considered the "core" of the region. As part of the East South Central States sub-group of the Census Bureau classification, Alabama, Mississippi, Tennessee and Kentucky are also frequently listed under the heading. At the highest extent, Kansas, and Missouri, may be included by some sources. All or parts these states are in the Central Time Zone. At different and changing points in time, all of the above states were/are considered part of the West in American history.

The climate varies from the semi-tropical in the Mississippi Delta, South Louisiana, and Southeast Texas, to the dry Chihuahuan desert in West Texas. The southeastern portions include the Appalachian mountains in Alabama and Tennessee and the Piney Woods of East Texas, Louisiana, and southern Arkansas and the Mississippi Delta. A large portion of the northeastern quarter of the region is mountainous, with the Ozark and Ouachita Mountains of Arkansas and eastern Oklahoma. The northwest quarter of the region is dominated by the Great Plains which become progressively drier west of 1,000° W, forming the North American Llano Estacado. The southwestern portions border the Rio Grande, and are generally drier than other areas of the South Central United States, Central Texas having the most annual precipitation.

...
Wikipedia